If you want to stop testing Android Oreo and go back to Android 7.x Nougat, you can do so by requesting a roll back over the air and if you do not wish to be part of the Nokia phones beta labs program, you can unregister as well. (androidauthority.com)
In a follow up Tweet, Mr. Sarvikas says that the Nokia 3, Nokia 5 and the Nokia 6 will be included in the Nokia Beta Labs program for the Oreo update and that they were «just starting» with the Nokia 8. (xda-developers.com)
Sarvikas thanked over 2,000 participants of the Nokia Mobile Beta Labs for their comments. (pocketnow.com)